Definition of Preboreal
adjective
Geology of, relating to, or denoting the first climatic stage of the postglacial period in northern Europe, between the Younger Dryas and Boreal stages (about 10,000 to 9,000 years ago). The stage was marked by a rapid spread of birch and pine forests. (as noun
the Preboreal)
the Preboreal climatic stage.
